/**
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jivesoftware.smackx.workgroup.packet;

import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.xmlpull.v1.XmlPullParser;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Agent status packet.
 * 
 * @author Matt Tucker
 */
public class AgentStatus implements PacketExtension {

	private static final SimpleDateFormat UTC_FORMAT = new SimpleDateFormat(
			"yyyyMMdd'T'HH:mm:ss");

	static {
		UTC_FORMAT.setTimeZone(TimeZone.getTimeZone("GMT+0"));
	}

	/**
	 * Element name of the packet extension.
	 */
	public static final String ELEMENT_NAME = "agent-status";

	/**
	 * Namespace of the packet extension.
	 */
	public static final String NAMESPACE = "http://jabber.org/protocol/workgroup";

	private String workgroupJID;
	private List<ChatInfo> currentChats = new ArrayList<ChatInfo>();
	private int maxChats = -1;

	AgentStatus() {
	}

	public String getWorkgroupJID() {
		return workgroupJID;
	}

	/**
	 * Returns a collection of ChatInfo where each ChatInfo represents a Chat
	 * where this agent is participating.
	 * 
	 * @return a collection of ChatInfo where each ChatInfo represents a Chat
	 *         where this agent is participating.
	 */
	public List<ChatInfo> getCurrentChats() {
		return Collections.unmodifiableList(currentChats);
	}

	public int getMaxChats() {
		return maxChats;
	}

	public String getElementName() {
		return ELEMENT_NAME;
	}

	public String getNamespace() {
		return NAMESPACE;
	}

	public String toXML() {
		StringBuilder buf = new StringBuilder();

		buf.append("<").append(ELEMENT_NAME).append(" xmlns=\"")
				.append(NAMESPACE).append("\"");
		if (workgroupJID != null) {
			buf.append(" jid=\"").append(workgroupJID).append("\"");
		}
		buf.append(">");
		if (maxChats != -1) {
			buf.append("<max-chats>").append(maxChats).append("</max-chats>");
		}
		if (!currentChats.isEmpty()) {
			buf.append("<current-chats xmlns= \"http://jivesoftware.com/protocol/workgroup\">");
			for (Iterator<ChatInfo> it = currentChats.iterator(); it.hasNext();) {
				buf.append(((ChatInfo) it.next()).toXML());
			}
			buf.append("</current-chats>");
		}
		buf.append("</").append(this.getElementName()).append("> ");

		return buf.toString();
	}

	/**
	 * Represents information about a Chat where this Agent is participating.
	 * 
	 * @author Gaston Dombiak
	 */
	public static class ChatInfo {

		private String sessionID;
		private String userID;
		private Date date;
		private String email;
		private String username;
		private String question;

		public ChatInfo(String sessionID, String userID, Date date,
				String email, String username, String question) {
			this.sessionID = sessionID;
			this.userID = userID;
			this.date = date;
			this.email = email;
			this.username = username;
			this.question = question;
		}

		/**
		 * Returns the sessionID associated to this chat. Each chat will have a
		 * unique sessionID that could be used for retrieving the whole
		 * transcript of the conversation.
		 * 
		 * @return the sessionID associated to this chat.
		 */
		public String getSessionID() {
			return sessionID;
		}

		/**
		 * Returns the user unique identification of the user that made the
		 * initial request and for which this chat was generated. If the user
		 * joined using an anonymous connection then the userID will be the
		 * value of the ID attribute of the USER element. Otherwise, the userID
		 * will be the bare JID of the user that made the request.
		 * 
		 * @return the user unique identification of the user that made the
		 *         initial request.
		 */
		public String getUserID() {
			return userID;
		}

		/**
		 * Returns the date when this agent joined the chat.
		 * 
		 * @return the date when this agent joined the chat.
		 */
		public Date getDate() {
			return date;
		}

		/**
		 * Returns the email address associated with the user.
		 * 
		 * @return the email address associated with the user.
		 */
		public String getEmail() {
			return email;
		}

		/**
		 * Returns the username(nickname) associated with the user.
		 * 
		 * @return the username associated with the user.
		 */
		public String getUsername() {
			return username;
		}

		/**
		 * Returns the question the user asked.
		 * 
		 * @return the question the user asked, if any.
		 */
		public String getQuestion() {
			return question;
		}

		public String toXML() {
			StringBuilder buf = new StringBuilder();

			buf.append("<chat ");
			if (sessionID != null) {
				buf.append(" sessionID=\"").append(sessionID).append("\"");
			}
			if (userID != null) {
				buf.append(" userID=\"").append(userID).append("\"");
			}
			if (date != null) {
				buf.append(" startTime=\"").append(UTC_FORMAT.format(date))
						.append("\"");
			}
			if (email != null) {
				buf.append(" email=\"").append(email).append("\"");
			}
			if (username != null) {
				buf.append(" username=\"").append(username).append("\"");
			}
			if (question != null) {
				buf.append(" question=\"").append(question).append("\"");
			}
			buf.append("/>");

			return buf.toString();
		}
	}

	/**
	 * Packet extension provider for AgentStatus packets.
	 */
	public static class Provider implements PacketExtensionProvider {

		public PacketExtension parseExtension(XmlPullParser parser)
				throws Exception {
			AgentStatus agentStatus = new AgentStatus();

			agentStatus.workgroupJID = parser.getAttributeValue("", "jid");

			boolean done = false;
			while (!done) {
				int eventType = parser.next();

				if (eventType == XmlPullParser.START_TAG) {
					if ("chat".equals(parser.getName())) {
						agentStatus.currentChats.add(parseChatInfo(parser));
					} else if ("max-chats".equals(parser.getName())) {
						agentStatus.maxChats = Integer.parseInt(parser
								.nextText());
					}
				} else if (eventType == XmlPullParser.END_TAG
						&& ELEMENT_NAME.equals(parser.getName())) {
					done = true;
				}
			}
			return agentStatus;
		}

		private ChatInfo parseChatInfo(XmlPullParser parser) {

			String sessionID = parser.getAttributeValue("", "sessionID");
			String userID = parser.getAttributeValue("", "userID");
			Date date = null;
			try {
				date = UTC_FORMAT.parse(parser.getAttributeValue("",
						"startTime"));
			} catch (ParseException e) {
			}

			String email = parser.getAttributeValue("", "email");
			String username = parser.getAttributeValue("", "username");
			String question = parser.getAttributeValue("", "question");

			return new ChatInfo(sessionID, userID, date, email, username,
					question);
		}
	}
}